US5785120A - Tubular patch - Google Patents
Tubular patch Download PDFInfo
- Publication number
- US5785120A US5785120A US08/748,987 US74898796A US5785120A US 5785120 A US5785120 A US 5785120A US 74898796 A US74898796 A US 74898796A US 5785120 A US5785120 A US 5785120A
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- United States
- Prior art keywords
- finger
- fingers
- middle portion
- liner
- outer diameter
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- Expired - Lifetime
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/10—Reconditioning of well casings, e.g. straightening
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
- E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
- E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
- E21B43/105—Expanding tools specially adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
- E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
- E21B43/106—Couplings or joints therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
- E21B47/095—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes by detecting an acoustic anomalies, e.g. using mud-pressure pulses
Definitions
- This invention is directed to systems for patching a hole or leak in a tubular member in a wellbore; to such systems that expand a liner patch to create a seal; and, in one particular aspect, to such a system that can be inserted through a relatively small diameter restriction as is presented by some types of tubing and then into a larger diameter member that has an area to be sealed.
- Oil and gas wells are ordinarily completed by first cementing casing in the hole. Occasionally, a leak develops at some point in the casing and permits the loss of well fluids to a low pressure, porous zone behind the casing, or permits an unwanted fluid such as water to enter the well.
- a principal use for liners in wells is to avoid the necessity for running an entire string of smaller casing in a well which already has a larger string of casing. Possibly the most common use is in the bottom of the well where the existing casing does not extend to the bottom of the well.
- a short liner is lowered through the casing into the bottom of the well where a seal is formed between the liner and casing to provide a metallic liner in the well to substantially its full depth.
- a seal between the liner and casing is generally provided by Portland cement pumped in back of the liner to fill the space between the liner and casing. Such seals are seldom perfect.
- the liner may not be as thick or strong as the casing.
- the liner When pressure is applied outside the liner and casing, the liner is compressed more than the casing and a crack forms between them even if none existed before.
- the pressures inside and outside the casing tend to become balanced, permitting the casing to return to its unstressed condition. This further widens the opening between the casing and liner.
- Pipe such as casing or tubing for oil wells may have variations in the inside wall which reduce or enlarge the inside diameter of the pipe. If such variations are present in an area of pipe which receives a liner, it is desirable to expand the liner to conform to such variations to provide an effective seal between the liner and the pipe.
- a difficulty encountered in utilizing liner expanding tools in casing or production tubing is in removing the tool after the tool has been driven through the liner. If there are restrictions in the diameter of the pipe in or above the area covered by the expanded liner, there is more likelihood that the tool may hang up at the restriction and possibly even damage the liner as it is pulled therethrough.
- U.S. Pat. No. 3,191,677 discloses liner setting apparatus with an expander ball which is driven through the liner by an explosive jar.
- U.S. Pat. No. 3,489,220 discloses a method and apparatus for setting a malleable liner having a reverse bend therein over a hole in the pipe, removing a reverse bend from the liner to enlarge the diameter thereof to slightly less than the inside diameter of the pipe and expanding the liner to fit tightly in the pipe.
- U.S. Pat. No. 3,785,193 discloses a tool for expanding a liner to fit tightly against the inside wall of a pipe such as oil well casing or tubing in spite of variations in the inside diameter of the pipe.
- the tool of this invention includes a mandrel that is adapted to be driven through the liner after the liner has been positioned over the hole or other defect in the pipe.
- a collet having flexible fingers extending therefrom is mounted on the mandrel and resiliently mounted pins extend from the mandrel to urge the fingers outwardly into yieldable engagement with the liner such that the liner is expanded to conform to the inside wall of a pipe.
- the collet may be mounted for slidable movement with respect to the laterally extending pins so that the flexible fingers can be moved inwardly as the tool is lowered into or removed from the pipe thereby preventing the fingers from damaging the liner or otherwise hanging up in the liner or pipe.
- One prior art method of repairing leaks in casing includes placing a steel liner in the well, then expanding it against the inside surface of the casing.
- the liner is corrugated longitudinally to reduce its diameter so that it will pass through the casing easily.
- a thin coating of an epoxy resin or other cementing material and a glass cloth mat are applied to the outside of the liner before it is run in the well.
- the corrugated liner is run in the well on a tubing string, then expanded against the casing by drawing an expander device through the liner with the upper end of the liner resting against the lower end of the tubing.
- the expander device is moved through the liner by a hydraulic pump, operated by fluid supplied through the tubing.
- tubing string must be pulled and run in the well twice, once to attach the sleeve and setting tool and once to remove the setting tool.
- Another problem is that weak sections in the tubing sometimes fail under the force of the hydraulic pressure used to operate the expander.
- U.S. Pat. No. 3,167,122 discloses a method and apparatus for expanding a steel liner in a casing using wire line equipment after the tubing has been removed from the well, thereby reducing the amount of time necessary to place the liner and avoiding the risk or rupturing the tubing with hydraulic pressure.
- the corrugated liner is supported on a rod attached to the wire line or cable with the rod passing through the longitudinal axis of the liner and the expander device attached to the rod below the liner.
- An explosive charge inside the liner is detonated when the liner is opposite the leak in the casing to expand the liner against the casing with sufficient force to anchor the liner so that the expander can be pulled through to complete the expansion of the liner.
- FIGS. 1A-1I show a prior art casing patch system co-owned with the present invention.
- the prior art system includes an upper connection for connection to a tubular string above the system (e.g. to a tubing string or coiled tubing) a centralizer, a slide valve, a bumper jar, an anchoring hydraulic hold down, a setting tool including dual hydraulic cylinders (each cylinder has a movable piston therein), extending rods (extending from a polish rod connected to a piston in one of the dual hydraulic cylinders to any extending rod which itself is connected to a safety joint), and an expander assembly that includes a safety joint, a cone, and a collet assembly, and a lower plug or end, e.g. a bull plug.
- the liner may be a steel liner and is initially located over the polish rod.
- the liner has been coated with epoxy resin and the system has been run into casing in a cased wellbore on a working string (e.g. a tubular string or coiled tubing).
- a working string e.g. a tubular string or coiled tubing.
- the liner is positioned adjacent a leak area ("Leak").
- FIG. 1B illustrates the working string is raised to close the circulating slide valve.
- FIG. 1C illustrates the application of hydraulic pressure (e.g. provided by an hydraulic fluid pumping system at the surface which pumps fluid down the working string and to the prior art patch system) which forces out movable buttons on the hydraulic hold down anchoring the system at the desired location in the casing and isolating the working string from tensile loads associated with the setting operation.
- hydraulic pressure e.g. provided by an hydraulic fluid pumping system at the surface which pumps fluid down the working string and to the prior art patch system
- the expander assembly is again forced through the corrugated patch, expanding it against the inside of casing. This procedure is continued until the entire patch is set.
- the epoxy resin coating is extruded into leaks or cavities in the casing wall and acts as a gasket and additional sealing agent. Setting time normally requires less than thirty minutes for a twenty foot patch. The tool is then removed from the hole and the patch is pressure tested as required.
- a system as shown in FIG. 1A permits limited expansion and contraction of its collet assembly and is not suitable as a "thru-tubing" system or a system to be run through a first relatively small tubular into a relatively larger tubular to be repaired.
- the present invention in certain embodiments discloses a tubular patch repair system which is insertable through a first tubular or tubular string (e.g. tubing, casing) and then is movable into a second tubular or tubular string whose inside diameter is larger than that of the first tubular or tubular string to repair a hole or leak in the second tubular or tubular string.
- a first tubular or tubular string e.g. tubing, casing
- such a system has at least one set of collet fingers each with an end movably secured to a housing and movable with resepct to a collet expander in response to fluid under pressure introduced into the system from the surface through a working string to push the collet fingers out from the body once the system is positioned beneath a liner to be expanded in the second tubular or tubular string. Pulling the expanded collet fingers and associated structure through the liner expands the liner to patch a hole in the second tubular.
- the system may ahve a sleeve shear pinned at the top of the body so that a top nose cone does not prematurely enter the liner.
- the pins are sheared following correct deployment of the collet fingers by pulling on the system.
- two sets of collet fingers which encircle a housing to which one end thereof is secured and encircle the expander with respect to which the other ends thereof are movable.
- the two sets are opposed to each other and, in certain aspects, have ends that meet and are offset radially to present a smooth overall expansion surface to a liner to be expanded.
- a system according to this invention has expandable collet fingers that contract when they exit the top of a liner that has been expanded. This occurs when fluid under pressure is no longer applied to the system so that internal spring(s) urge the fingers back to an initial non-expanded position.
- an expander system for passage through a liner patch to expand the liner patch to seal a hole in a tubular member, the tubular member part of a tubular string in a wellbore extending from a surface of the earth down into the earth, the expander system having a body having a top, a bottom, and a middle portion, the top having an outer diameter, the bottom having an outer diameter substantially equal to the outer diameter of the top, and the middle portion having an outer diameter greater than the outer diameter of the top, a first set of first fingers, each first finger movable and having a first finger top and a first finger bottom, the first finger bottoms disposed around the top of the body and releasably connected thereto, a second set of second fingers (either set optional), each second finger movable and having a second finger top and bottom, the tops disposed around the bottom of the body and releasably connected thereto, movement apparatus for releasing the sets of fingers and moving them to abut the middle portion so that they project
- the present invention discloses an expander system for passage through a liner patch to expand the liner patch to seal a hole in a tubular member, the tubular member part of a tubular string in a wellbore extending from a surface of the earth down into the earth, the expander system having a body having a top, a bottom, and a middle portion, the top having an outer diameter, the bottom having an outer diameter substantially equal to the outer diameter of the top, and the middle portion having an outer diameter greater than the outer diameter of the top, a first set of first fingers, each first finger movable and having a first finger top and a first finger bottom, the first finger bottoms disposed around the top of the body and releasably connected thereto, a second set of second fingers, each second finger movable and having a second finger top and a second finger bottom, the second finger tops disposed around the bottom of the body and releasably connected thereto, movement apparatus for releasing the first and second sets of fingers from the body and moving the fingers
- the present invention discloses an expander system for passage through a liner patch to expand the liner patch to seal a hole in a tubular member, the tubular member part of a tubular string in a wellbore extending from a surface of the earth down into the earth, the expander system having a body having a top, a bottom, and a middle portion, the top having an outer diameter, the bottom having an outer diameter substantially equal to the outer diameter of the top, and the middle portion having an outer diameter greater than the outer diameter of the top, a first set of first fingers, each first finger movable and having a first finger top and a first finger bottom, the first finger bottoms disposed around the top of the body and releasably connected thereto, a second set of second fingers, each second finger movable and having a second finger top and a second finger bottom, the second finger tops disposed around the bottom of the body and releasably connected thereto, movement apparatus for releasing the first and second sets of fingers from the body and moving the
- the present invention discloses an expander system for passage through a liner patch to expand the liner patch to seal a hole in a tubular member, the tubular member part of a tubular string in a wellbore extending from a surface of the earth down into the earth, the expander system having a body having a top, a bottom, and a middle portion, the top having an outer diameter, the bottom having an outer diameter substantially equal to the outer diameter of the top, and the middle portion having an outer diameter greater than the outer diameter of the top, a first set of first fingers, each first finger movable and having a first finger top and a first finger bottom, the first finger bottoms disposed around the top of the body and releasably connected thereto, a second set of second fingers, each second finger movable and having a second finger top and a second finger bottom, the second finger tops disposed around the bottom of the body and releasably connected thereto, movement apparatus for releasing the first and second sets of fingers from the body and moving the fingers
- FIG. 1A is a side view in cross-section and cutaway of a prior art casing patch system.
- FIG. 1B is a side view in cross-section and cutaway of part of the system of FIG. 1A.
- FIGS. 1C-1E show steps in the operations of the system of FIG. 1A.
- FIG. 1F is a side cutaway view showing the use of the system of FIG. 1A.
- FIG. 1G shows a liner patch in a casing prior to liner patch expansion.
- FIG. 1H shows the liner patch of FIG. 1G expanded in the casing.
- FIG. 1I is an exploded view showing various parts of the system of FIG. 1A.
- FIGS. 2A-2C are side cross-section views of a patch system according to the present invention.
- FIGS. 3A-3E, 4A, 4B and 5 are enlarged views of parts of the system of FIG. 2A.
- FIGS. 6A and 6B are side views in cross-section of a patch system according to the present invention.
- FIGS. 7A-7C are top views in cross-section of liner patches according to the present invention.
- FIGS. 8A and 8B are side views in cross-section of a patch system according to the present invention.
- FIGS. 2A shows a system 10 according to the present positioned beneath a liner casing patch P in a cased wellbore (not shown, like the casing in FIG. 1A) prior to movement of the system 10 through the liner patch P.
- the system 10 may include (and does in this particular aspect) the items and apparatuses above the cone of the system of FIG. 1A and the description of them is repeated here.
- FIG. 2B shows the system 10 with collet fingers 52 and 92 moved and held outwardly.
- FIG. 2C shows the cone 11 after it has begun its entry into the liner patch P.
- FIG. 3A shows parts of the system 10 according to the present invention as shown in FIG. 2A.
- the system 10 has a cone 11 initially disposed in a sleeve 12 which itself is shear pinned with three shear pins 13 (two shown) to a piston housing 22.
- the cone 11 has a shaft 14 threadedly engaged in a recess 23 of the piston housing 22.
- a shoulder 15 of the cone 11 rests initially against a shoulder 16 of the sleeve 12.
- An upper end 17 of the sleeve 12 is sized, disposed and configured to abut a lower end L of a liner patch P (shown partially in FIGS. 2A and 3A) so that a tapered end portion 18 of the cone 11 either initially touches or is closely adjacent the lower end L of the liner patch P.
- the sleeve 12 prevents the cone 11 from entering the liner patch P.
- a lower end 24 of the piston housing 22 is threadedly connected to an upper spring seat 40.
- An upper piston 20 is movably disposed in an interior piston channel 25 of the piston housing 22.
- a lower end of a connecting rod 19 is threadedly connected in a top recess 26 of the upper piston 20.
- a top end (not shown) of the connecting rod 19 is connected to a hollow extension rod (not shown) (like the extending rod of FIG. 1A, but with a fluid flow channel therethrough) (like the hollow rod W, FIG. 6B).
- the connecting rod 19 is movable in the interior piston channel 25 and through an interior channel 21 of the cone 11.
- Fluid in the interior piston channel 25 is expelled through two relief ports 27 through the piston housing 22.
- Fluid e.g. working fluid pumped from the surface by a surface pumping unit through a string interconnected with the connecting rod 19
- pressure e.g. water, mud, drilling fluid, hydraulic fluid
- the string e.g. tubular string, coiled tubing string, etc.
- An O-ring seal 30 seals the connecting-rod-19-piston-housing-22 interface.
- a T-seal 31 (made e.g. of elastomeric or rubber material, e.g. commercially available Viton material) seals the upper-piston-20-piston-housing-22 interface.
- a T-seal 32 seals the upper-spring-seat-40-connecting-rod-34 interface.
- An O-ring seal 33 seals the piston-housing-22-upper spring seat 40 interface.
- the upper piston rod 34 moves within an interior channel 41 of the upper spring seat 40; within a set of belleville springs 51 positioned in an upper collet 50; within a spring sleeve 53 in the upper collet 50; within a coil spring 54; and within a collet expander 70 (see FIGS. 3A, 3B, and 3C).
- a lower end 42 of the spring seat 40 is threadedly connected to an upper end of the upper collet 50.
- the belleville springs 51 are disposed in an interior channel 55 of the upper collet 50 with a top end of the springs 51 abutting the lower surface of the upper spring seal 40.
- Fluid relief ports 56 provide for the expulsion of fluid from within the interior channel 55.
- each finger 52 has a male detent 60 initially receivable and holdable in a corresponding female recess 72 of the collet expander 70.
- the fingers 52 are about fourteen inches long with a space of about one-eighth inch between adjacent fingers and as shown in FIG. 3E with ends of fingers 52 offset from ends of fingers 92. About three thousand pounds of force is required to move such fingers out of their corresponding female recesses.
- the belleville springs 51 have a spring force between about one thousand four hundred to about seven thousand pounds and, in one particular aspect, about four thousand pounds; and the coil spring 54 has a spring force between about seven hundred pounds to about two thousand five hundred pounds and, in one particular aspect, about one thousand five hundred pounds.
- a force of about seven hundred and fifty pounds must be continuously applied to move the collet fingers along the outer edge of the collet expander 70 and a force of about four thousand pounds is needed to move the made detents 60 out from the corresponding female recesses 72.
- Bottoming out (e.g. lower end abuts top of collet expander) of the spring sleeve 53 isolates the coil spring 54 and permits a load to be transmitted to the belleville springs 51 so that sufficient force can be applied to move the fingers along the collet expander.
- the collet expander 70 is generally cylindrical with a top inner channel 73 in the top end 71 in which the upper piston rod 34 moves and with a central channel 74 in which the upper piston rod 34 moves and in which moves a lower piston 80 to which a lower end of the upper piston rod 34 is threadedly connected.
- Each male detent 60 of the fingers 52 is movable into a female recess 75 on the collet expander 70.
- Fluid relief ports 76 provide for the expulsion of fluid from within the collet expander 70.
- Working fluid from the surface is flowable down through the upper piston rod 34 and out through ports 81 in the lower piston 80 into a space in the central channel 74 between the lower piston 80 and a top end 77 of a lower collet expander body (with some space between the lower piston 80 and the interior surface of the central channel 74). These structures are sealed similarly to those related to the upper spring seat.
- Fingers 92 of the lower collet 90 have male detents 99 which are initially held in corresponding female recesses 78 of the lower collet expander body 77.
- Top curved surfaces 91 of the fingers 92 correspond to the recesses 57 of the fingers 52 and are receivable therein.
- the upper and lower ends of the collet expander 70 and its central portion are sized and configured to provide a desired amount of radial expansion of the fingers 52 and 92 which completely encircle the collet expander.
- the initial maximum diameter of the system 10 e.g. the diameter at the initial location of the fingers 52 or 92 in FIG. 3A
- the expanded diameter is slightly less than 5.921 inches.
- expansion is about one, one and a half, two, three, six, twelve, twenty or thirty inches.
- a lower piston rod 94 has a top end threadedly connected to the lower piston 80 and a bottom end threadedly connected to a bull plug 130.
- the lower piston rod 94 movably extends through the lower collet expander body 77; through a coil spring 95 in the lower collet 90; through a spring sleeve 96 within the coil spring 95; through a set of belleville springs 97; and through a lower spring seat 120.
- the coil spring 95 like the previously described coil spring 54, may be like the specific embodiments of the coil spring 54 described above.
- the belleville springs 97 are like the described belleville springs 51; and certain specific embodiments thereof are like embodiments of the belleville springs 51 described above.
- Fluid relief ports 98 provide for the expulsion of fluid from within the lower collet 90.
- An inner shoulder 105 of the lower collet 90 is movable to abut the lower end of the lower collet expander body 77 thereby arresting motion of the lower collet with respect to the collet expander 70.
- the fingers 92 are formed and configured as the fingers 52, described above, with holes 101 therebetween.
- FIGS. 4A and 4B show relative positions of certain parts of the system 10 upon the application of working fluid under pressure.
- the force of the fluid has moved the upper piston housing 22 down with respect to the upper piston 20 and has moved the collet expander 70 down with respect to the lower piston 80 by applying sufficient force to move the fingers' male detents from the recesses 72, 78 respectively, along the exterior of the collet expander 70, and into the recesses 75, 79 respectively.
- the top curved finger portions 91 of the fingers 92 have moved into the recesses 57 of the fingers 52.
- the shear pins 13 have not yet been sheared and the cone 11 has not yet moved into the liner patch P.
- the pistons of the setting tool are moving.
- the length of the extension rod 34 is related to the length of the liner patch P used.
- the length of the liner patch P also determines the length of additional rods (extension rods) connected to the setting tool.
- the major components of the system 10 are made of steel, e.g. 4140 steel.
- the polish rods may be made of 17-4PH stainless steel and the upper and lower collets may be made of 4145 steel.
- the components are made of brass, bronze, aluminum, zinc, other suitable metals, or alloys or combinations thereof.
- the circulation of working fluid is stopped, and the system is raised by pulling up on the working string.
- the hold down anchor apparatus is automatically released when fluid under pressure ceases to be pumped to the hold down anchor apparatus.
- the system is then raised a desired amount and the hold down is reset, working fluid is again circulated re-expanding the collet fingers, and the system 10 is again pulled further up through the liner patch P. This is done until the liner patch P has been expanded along its entire length.
- the anchoring hold down and the collets automatically contract so that the system 10 assumes its original diameter and is freed for removal from the wellbore.
- about two feet of a liner patch P are expanded for an initial stroke of a setting tool. Each subsequent stroke expands about ten feet of the liner patch P.
- the system is run into a cased wellbore and may be run through an interior string, e.g. a tubing string, with a smaller inner diameter than that of casing which extends down below a lower end of the inner tubing string.
- an interior string e.g. a tubing string
- the system exits the tubing string it is moved to a location in the casing at which there is a hole or leak area to be patched.
- working fluids are circulated down to the system at about 1000 p.s.i. to expand the collet fingers.
- Working fluid pressure is then increased to shear the cone shear pins, e.g. to about 1500 p.s.i.
- pressure is increased e.g. to 3500 p.s.i. to 5000 p.s.i. to pull the collet through the patch as the setting tool pulls the expanded collet assembly through the liner patch.
- Working fluid circulation is then stopped and the system is then pulled up on to re-set the setting tool to re-stroke hydraulic cylinders in the setting tool. Then the expansion cycle is repeated until complete liner patch expansion is achieved.
- FIGS. 6A and 6B show a system 200 according to the present invention for expanding a liner patch C (shown partially in FIG. 6A) which may be any known liner patch of any suitable length, e.g. but not limited to a liner patch of length five feet, ten feet, twenty feet or more or a combination of a plurality of such liner patches in series end-to-end in a tubular, tubing, or casing).
- a connecting rod 201 extends to equipment and apparatuses above an expander assembly 210, the apparatuses and equipment like that described above for the system of FIG. 1A and for the system 10.
- a fluid flow channel 203 provides working fluid from the surface, through a work string or coiled tubing, to the system 200.
- the connecting rod 201 extends through a cone 211, through an upper cylinder 204, and has a lower end threadedly connected to a piston 220.
- the connecting rod 201 is shear pinned (e.g. with a shear pin that shears in response to a 5000 p.s.i. force) by a shear pin 206 to the upper cylinder 204.
- the upper cylinder 204 is threadedly connected to a piston cylinder 207 and an O-ring seal 208 seals the upper-cylinder-204-piston-cylinder-207 interface.
- Working fluid flows down through the fluid flow channel 203 and out through ports 211 into a space 212 above the piston 220.
- a lower piston rod 213 has a top end threadedly connected to the piston 220 and a bottom end secured outside a cone 214 with a nut 215.
- a collet expander 230 is situated between the cones 211 and 214.
- the collect expander 230 has a middle portion 231 through which passes the piston cylinder 207.
- the piston cylinder 207 is movable with respect to the expander and the lower and upper rods.
- a body 232 surrounds and extends above and below the middle portion 231.
- a series of upper collet fingers 233 threadedly connected to the cone 211 have their male detents 234 releasably positioned in corresponding female recesses 235 on the body 232 and a series of lower collet fingers 236 threadedly connected to the cone 214 have their male detents 237 releasably positioned in corresponding female recesses 238 on the body 232.
- Adjusting plates 239 are removably secured by bolts 241 to the body 232. As shown in FIG. 6A the male detents 234 and 237 rest on the adjusting plates 239 when the system 200 is ready to enter the liner patch C. By using adjusting plates of different thickness, the extent to which the collet fingers 233 and 236 project out from the body 232 is adjustable. In one aspect a plurality (two, three, four or more) of interchangeable adjusting plates 239 is provided with the system 200 so that the system 200 may be used with casing having varying internal diameters. For example, and without limitation, casing with a nominal 20 inch outside diameter may have an inner diameter that varies up to 0.466 inches.
- the adjusting plates 239 may be in the form of two semi-circular half shells installable with bolts on the body 232.
- the cones 211 and 214 are urged apart by a coil spring 243 disposed between the cone 211 and the middle portion 231 of the collet expander 230 and by a coil spring 244 disposed between the cone 214 and the middle portion 231 of the collet expander 230.
- the springs have a spring force of about fourteen thousand pounds when the system is used to expand a liner patch in twenty inch casing.
- the collet fingers 233 and 236 have expanded outwardly by pulling up on the connecting rod 201 with a setting tool (not shown; like those previously described) and the system 200 is ready to be pulled by the setting tool through the liner patch C which is disposed in a casing (not shown) having a hole or leak to be sealed off by the liner patch C.
- a keyway-key or spline-groove arrangement may be used to connect the lower piston rod 213 and the cone 214 so the lower piston rod does not rotate with respect to the cone 214.
- each finger 233 has a recess 251 which receives a part of an upper curved portion 252 of each finger 236 so that a smooth surface without finger end gaps is presented to a liner patch to be expanded.
- the system 200 has exited the liner patch C and is ready to be removed from the wellbore in which the properly sealed casing is disposed.
- a safety joint 260 is interposed between a working string W and the system 200 in the event the system 200 needs to be "fished" from the wellbore.
- the safety joint 260 is shear pinned with a shear pin 261 to the connecting rod 201 (e.g. set to shear in response to torque).
- Upon shearing of the safety joint shear pin a fish neck 263 is exposed which is engageable by known fishing tools, e.g. an overshot tool.
- FIGS. 7A-7C show top cross-section views of liner patches according to the present invention (which may be any desired length).
- the materials used may be steel, stainless steel, zinc, brass, bronze, or any suitable metal or metal alloy of any desired thickness.
- the liner patches of FIGS. 7A-7C are made of mild steel (e.g. 1018 steel) about 0.089 inches in wall thickness. They can vary in certain aspects from 0.065 inches to 0.1875 inches in wall thickness.
- a liner patch 300 shown in FIG. 7A has 8 corrugations each with an angle of about 30° and at an angle of about 75° to each other.
- the liner patch 300 has an inner diameter of 2.125 inches, an outer diameter of 4.25 inches, and a circumference of about 6 inches.
- Such a liner patch is suitable for sealing a hole in six and five eights inch casing; but it is within the scope of this invention to size and configure the liner patch 300 for use with any casing or tubular.
- a liner patch 301 shown in FIG. 7B has 10 corrugations each with an angle of about 39° and at an angle of about 75° to each other.
- the liner patch 301 has an inner diameter of 2.6019 inches, an outer diameter of 4.25 inches, and a circumference of about 6 inches.
- Such a liner patch is suitable for sealing a hole in six and five eights inch casing; but it is within the scope of this invention to size and configure the liner patch 301 for use with any casing or tubular.
- a liner patch 302 shown in FIG. 7C has 10 corrugations each with an angle of about 20° and at an angle of about 55° to each other.
- the liner patch 302 has an inner diameter of 2.125 inches, an outer diameter of 4.25 inches, and a circumference of about 6 inches.
- Such a liner patch is suitable for sealing a hole in six and five eights inch casing; but it is within the scope of this invention to size and configure the liner patch 302 for use with any casing or tubular.
- FIGS. 8A and 8B show a system 300 according to the present invention for expanding a liner patch L (shown partially in FIG. 8A) which may be any known liner patch of any suitable length, e.g. but not limited to a liner patch of length five feet, ten feet, twenty feet or more or a combination of a plurality of such liner patches in series end-to-end in a tubular, tubing, or casing).
- a connecting rod 301 extends to equipment and apparatuses above an expander assembly 310, the apparatuses and equipment like that described above for the system of FIG. 1A, the system 10, and the system 200.
- a fluid flow channel 303 provides working fluid from the surface, through a work string or coiled tubing, to the system 300.
- the connecting rod 301 extends through a cone 311, through an upper cylinder 304, and has a lower end threadedly connected to a piston 320.
- the connecting rod 301 is shear pinned (e.g. with a shear pin that shears in response to a 5000 p.s.i. force) by a shear pin 306 to the upper cylinder 304.
- the upper cylinder 304 is threadedly connected to a piston cylinder 307.
- Working fluid flows down through the fluid flow channel 303 and out through ports 312 into a space above the piston 320.
- a lower piston rod 313 has a top end threadedly connected to the piston 320 and a bottom end secured outside a plug 314 with a nut 315.
- a collet expander 330 is situated between the cone 311 and the plug 314.
- the collect expander 330 has a middle portion 331 through which passes the piston cylinder 307.
- a body 332 surrounds and extends above and below the middle portion 331.
- a series of upper collet fingers 333 have male detents 334 releasably positioned in corresponding female recesses 335 on the body 332 and a series of lower collet fingers 336 have male detents 337 releasably positioned in corresponding female recesses 338 on the body 332.
- Adjusting pads 339 are removably secured by bolts 341 to the fingers 333 and 336.
- the pads 339 project from the fingers when the system 300 is ready to enter the liner patch L.
- the extent of projection out from the body 332 is adjustable to accommodate liner patches of different inner diameters.
- a plurality (two, three, four or more) of adjusting pads 339 is provided with the system 300 so that the system 300 may be used with casing having varying internal diameters.
- casing with a nominal 20 inch outside diameter may have an inner diameter that varies up to 0.466 inches.
- the cone 311 is urged apart from an inner cone 350 by a coil spring 343 disposed between the cone 311 and a flange 351 of a sleeve 352 disposed around the rod 301.
- the spring has a spring force of about twenty thousand pounds when the system is used to expand a liner patch in twenty inch casing.
- a lower end 353 of the sleeve 352 rests on a spacer 354 made of steel.
- the collet fingers 333 and 336 have expanded outwardly by pulling up on the connecting rod 301 with the setting tool and the system 300 is ready to be pulled by the setting tool through the liner patch L which is disposed in a casing (not shown) having a hole or leak to be sealed off by the liner patch L.
- the fingers 333, 336 are retracted from their expanded position to their initial position (see FIG. 8B) and the removal of the system 300 is facilitated.
- the spring 343 forces the finger detents back into their recesses automatically.
- a keyway-key or spline-groove arrangement may be used to connect the lower piston rod 313 and the cone 314 so the lower piston rod does not rotate with respect to the cone 314.
- each finger 333 has a recess which receives a part of an upper curved portion of each finger 336 so that a smooth surface without finger end gaps is presented to a liner patch to be expanded (as with the fingers 233, 236 described above).
- a safety joint 360 is interposed between a working string G and the system 300 in the event the system 300 needs to be "fished" from the wellbore.
- the safety joint 360 is shear pinned to the connecting rod 301 (e.g. like the rod 201 and pin 261). Upon shearing of the safety joint shear pin a fish neck is exposed which is engageable by known fishing tools, e.g. an overshot tool.
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Acoustics & Sound (AREA)
- Geophysics (AREA)
- Earth Drilling (AREA)
- Pipe Accessories (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
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Priority Applications (13)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/748,987 US5785120A (en) | 1996-11-14 | 1996-11-14 | Tubular patch |
US08/946,145 US5957195A (en) | 1996-11-14 | 1997-10-07 | Wellbore tool stroke indicator system and tubular patch |
AU49550/97A AU732007B2 (en) | 1996-11-14 | 1997-11-14 | Apparatus and method for expanding a liner patch; a stroke indicator; and a tubular patch |
EP04104558A EP1491718B1 (en) | 1996-11-14 | 1997-11-14 | A Stroke Indicator and a Tubular Patch |
CA002539625A CA2539625C (en) | 1996-11-14 | 1997-11-14 | Apparatus and method for expanding a liner patch |
PCT/GB1997/003049 WO1998021444A2 (en) | 1996-11-14 | 1997-11-14 | Apparatus and method for expanding a liner patch; a stroke indicator; and a tubular patch |
DE69735128T DE69735128D1 (de) | 1996-11-14 | 1997-11-14 | Vorrichtung und verfahren zum expandieren eines liner flickens, hubanzeigevorrichtung und rohrförmiger flicken |
DE69736085T DE69736085D1 (de) | 1996-11-14 | 1997-11-14 | Eine Hubanzeige und ein rohrförmiger Flicken |
EP97912307A EP0948703B1 (en) | 1996-11-14 | 1997-11-14 | Apparatus and method for expanding a liner patch; a stroke indicator; and a tubular patch |
CA002270986A CA2270986C (en) | 1996-11-14 | 1997-11-14 | Apparatus and method for expanding a liner patch |
US09/183,943 US6142230A (en) | 1996-11-14 | 1998-10-31 | Wellbore tubular patch system |
NO19991666A NO314511B1 (no) | 1996-11-14 | 1999-04-08 | Apparat og fremgangsmåte for ekspandering av en utbedringsfôring |
NO20021323A NO325410B1 (no) | 1996-11-14 | 2002-03-18 | Slagindikator og fremgangsmate for angivelse av et slag i ekspansjonssystem med rorformet utbedringsfôring |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/748,987 US5785120A (en) | 1996-11-14 | 1996-11-14 | Tubular patch |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/946,145 Continuation-In-Part US5957195A (en) | 1996-11-14 | 1997-10-07 | Wellbore tool stroke indicator system and tubular patch |
Publications (1)
Publication Number | Publication Date |
---|---|
US5785120A true US5785120A (en) | 1998-07-28 |
Family
ID=25011740
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/748,987 Expired - Lifetime US5785120A (en) | 1996-11-14 | 1996-11-14 | Tubular patch |
Country Status (6)
Country | Link |
---|---|
US (1) | US5785120A (no) |
EP (1) | EP0948703B1 (no) |
AU (1) | AU732007B2 (no) |
CA (1) | CA2270986C (no) |
NO (2) | NO314511B1 (no) |
WO (1) | WO1998021444A2 (no) |
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Also Published As
Publication number | Publication date |
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AU4955097A (en) | 1998-06-03 |
WO1998021444A2 (en) | 1998-05-22 |
NO991666L (no) | 1999-06-23 |
NO314511B1 (no) | 2003-03-31 |
NO20021323D0 (no) | 2002-03-18 |
EP0948703B1 (en) | 2006-01-18 |
NO991666D0 (no) | 1999-04-08 |
AU732007B2 (en) | 2001-04-12 |
CA2270986A1 (en) | 1998-05-22 |
EP0948703A2 (en) | 1999-10-13 |
NO20021323L (no) | 1999-06-23 |
NO325410B1 (no) | 2008-04-21 |
WO1998021444A3 (en) | 1998-08-27 |
CA2270986C (en) | 2007-08-21 |
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